Re: Segmentation Fault with Octave MXE under Windows

[Daniel J Sebald]

On 07/10/2014 10:03 AM, Carnë Draug wrote:
[snip]
> > The following may be complete rubbish or related if there's something
> > related to scope of functions: imformats keeps a persistent struct
> > with function handles for the private functions within
> > "m/image/private". This is created during the first call to one of the
> > image IO functions (imwrite, imread, and imfinfo).
>
> It may still be related with this (just not from that specific line).
> As I mentioned before, imformats() is called for each of the imageIO
> functions. Try to remove the persistence of the structure it creates
> internally and see if that fixes it.

If removing the persistence does fix the problem, it still isn't the 
ultimate solution because one shouldn't be able to cause a segmentation 
fault by some combination of script commands.  Yes, a choice of script 
commands could cause incorrect behavior, but it shouldn't cause a segfault.

Ian, what Carnë is suggesting to try is: edit the file

./scripts/image/imformats.m

so that the line

  persistent

becomes

  formats = default_formats ();

and the line

  persistent formats = struct ( "coder", {},
                                "ext", {},
                                "isa", {},
                                "info", {},
                                "read", {},
                                "write", {},
                                "alpha", {},
                                "description", {},
                                "multipage", {});

becomes

  formats = struct ( "coder", {},
                     "ext", {},
                     "isa", {},
                     "info", {},
                     "read", {},
                     "write", {},
                     "alpha", {},
                     "description", {},
                     "multipage", {});

Is that right Carnë?

Dan



> [1] 
> http://octave.1599824.n4.nabble.com/Segmentation-Fault-with-Octave-MXE-under-Windows-tp4664305p4664470.html